Did a set recently for my 421 using the POR-15 manifold gray. Previously used it on another set of RA manifolds and after 5 years and 30k miles of daily driving it still looked nice.
Pretty much your best option for value and durability. This stuff has a long shelf life, I’ve used it 20 years after first opening the can and it was still fine after thinning it with a little mineral spirits.
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1964 Tempest Coupe LS3/4L70E/3.42
1964 Le Mans Convertible 421 HO/TH350/3.08
2002 WS6 Convertible LS1/4L60E/3.23
1966 VW Type 2 Single Cab Pickup 140hp 2276
1956 VW Type 2 Panel Van 36hp 1200
1957 VW Type 1 Beetle 180hp 2276
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